COLMI R02 Smart Ring Silver (Size 8) — Health Tracker with Heart Rate & SpO2, Portable Charging Case

The COLMI R02 is a compact smart ring that tracks heart rate, blood oxygen, sleep and daily activity while charging in its portable case—no subscription required.

The COLMI R02 combines discreet wearability with continuous health and activity monitoring for both women and men. Designed to sit comfortably on your finger, it offers around-the-clock heart rate and blood oxygen sensing, sleep analysis calibrated for night cycles, and basic activity tracking without ongoing subscription fees. The package includes a compact charging case so the ring can be recharged on the go, plus a charging cable and manual.

How accurate are the heart rate and blood oxygen readings?

The R02 provides frequent optical heart-rate monitoring and spot measurements for blood oxygen (SpO2) using on-board sensors. It is intended for day-to-day wellness tracking and trend observation rather than clinical diagnosis.

• 24/7 heart-rate monitoring with adjustable sampling frequency.
• Periodic SpO2 spot checks for short-term oxygen trends.
• Algorithms filter out typical hand movements to reduce noise.
• Best used for trend awareness, not medical decisions.

What is the battery life and how does the charging case work?

Battery duration depends on selected monitoring intensity. The included portable charging case stores and recharges the ring so you can top up power anywhere without searching for an outlet.

• Basic Mode: roughly 4–5 days (steps and basic sleep tracking).
• Balanced Mode: about 3–4 days (heart rate sync every 60 minutes).
• Enhanced Mode: around 2–3 days (continuous real-time heart-rate monitoring).
• Compact charging case and cable included for convenient recharging.

Does the R02 require a subscription or special app purchases?

No subscription fees are required to use the core features of the COLMI R02. Once paired, you can access heart-rate data, sleep summaries, and activity trends through the companion app without monthly charges.

• No app subscription or hidden monthly fees.
• Core functions unlocked immediately after pairing.
• Daily health trends and long-term activity stored locally or in the app.
• Remote camera control included for quick phone photos.

How should I choose the correct ring size for comfort and accuracy?

A proper fit preserves sensor contact and ensures accurate readings. COLMI recommends using the sizing kit or measuring your finger with the size chart before ordering to avoid exchanges.

• Purchase the COLMI sizing kit or follow the size chart closely.
• A snug but comfortable fit keeps sensors aligned with skin.
• Incorrect sizing can cause data inconsistencies or discomfort.
• Contact COLMI support for after-sales help if needed.

Who is this for? The COLMI R02 is aimed at people who want a low-profile wearable to monitor wellness trends—heart rate, SpO2, sleep patterns and daily activity—without subscription costs. It suits commuters, busy professionals, and anyone who prefers ring-style wearables to wrist devices, provided they choose the correct size for a consistent fit.